Does a multi CX Card setup need multiple amplifier cards?

I'm beginning to look into a CX card setup for VHS archiving. Reading through the github documentation, I see the ADA4857 amplifier card mentioned. I also see that for VHS, you need 2 CX cards; one for video, one for audio(?). Do I need an amplifier card for each CX card?

Similarly, do I need one of everything for each CX card, like BNC connectors and quartz clocks for the mod?